Definition of aliethmoid in US English:

aliethmoid

noun

rare
  • A lateral expansion of the ethmoid bone in certain birds; also as adjective.

Origin

Mid 19th century; earliest use found in William K. Parker (1823–1890), comparative anatomist and zoologist.

Pronunciation

aliethmoid

/ˌalɪˈɛθmɔɪd/